Electromagnetic switch



A ril 29, 1930. F. DORING ET AL ELECTROMAGNETIC SWITCH Filed Oct. 11,1926 Inueu firs PM 2 Dl'jrin and. K unrad Muller 15 is so chosen thatthe plane formed by iatentcd Apr. 129, 193% UNITED STATES ATENTTOFF1EFRITZ BORING, OF BERLIN-FROHNAU, AND KONBAD MI TLLER, F BERLIN-SIEMENS-I STADT, GEBMANY ASSIGNORS T0 SIEMENS & HALSKE AKTIENGESELLSCHAFT, OF

WERNERWEBK, SIEMENSSTADT, NEAR BERLIN, GERMANY ELECTROMAGNETIC swrrcnApplication filed Qetobcr 11, 1926, Serial No.

the boundary planes of the switch cylinder.

It is advisable to locate the driving magnet and the switch cylinderparallel to one another, but this arrangement is not essential.According to the invention the position of the driving magnet and theswitch cylindler driving magnet and by the switch cylinder runs parallelto the plane of the contact.

springs, which are influenced by the switch cylinder. Owing to thisarrangement and especially due to the fact that according to theinvention the contact spring sets are provided at both sides of theswitch cylinder,

the switch has comparatively little width,

and unused spaces between the switch parts are avoided as mch asossib'le.

Another means for o taining a very compact arrangement in theconstruction of the cylinder switches while at the same time obtaining areliable operation of the contacts consists according to the inventionin bending the operating end of the contact springs at right angles,these springs being directly controlled bythe switch members of thecylinder and located within reach of the switch members.

One method of carrying out the invention will be described by way ofexample with reference to the drawing.

Figure 1 therein shows a side view of the switch, from which, for thesake of greater clearness, has been removed one of the two angle ironscarrying the contact spring sets. Figure 2 is a front view and Figure 3is a back: view of the switch.

140,811, and in Germany February 13, 1926.

Figure 4 shows separately one of the contact spring sets as seen fromthe back.

The main parts of the switch shown comprise the driving magnet 1, theswitch cylinder 2 and the contact spring sets 3 and 4, located on eitherside of these parts. The contact sprin sets are mounted'on two angleirons 5 an 6, which are connected together by means of screws. On oneside of the angle irons, namely 5, is also mounted the switch cylinderand below the latter the driving magnet 1 1s fixed parallel thereto. Thearmature 7 of this magnet is. rotatably mounted onthe .yoke 8. In itsnormal position the armatureris held by a leaf spring 9, which alsoserves to move it back from its operated to the normal osition. An arm10 bent down at the side 0 the armature 7 carries at its free end theoperating pawl12, which operates the tooth wheel 11 of theswitchcylinder 2. The pawl 12 is likewise movably mounted and is pressedagainst the tooth wheel 11 by the tension of a spiral spring 13, The

tooth wheel 11 is held in any particular position by the holding pawl14, which comprises a leaf spring fixed to the angle iron '5. The switchcylinder '2 consists of the shaft 17, which is rotatably mounted in thebent strips 15, 16 of the angle iron 5, the cams 18 of insulatingmaterial fixed to the shaft and the tooth wheel 11 located at one end ofthe shaft. The other end of the shaft 17 carries a round disc 19, whichat its outer end is provided with numbered divisions. In conjunctionwith a rigidly fixed pointer 20, the disc serves to indicate thedifferent positions of the switch. By means of special holding meansherein not described, the cam discs 18 are fixed on the shaft 17 at suchdistances from "each other that each cam disc 18 can operate one of thecontact spring sets 3, and 4, located on both sides of the switch, thearrangement being such that the first, third, fifth. etc. cam disc 18operates the contact spring sets 3 on the one side, while the second,

fourth, sixth, etc. cam'disc operates the contact springs 4 on the otherside.

As can be seen from the Figures 2 and 3, each spring set consists ofthree leaf springs 3 3*, 3 or 4, 4", 4". The two inner springs, forexample 3 and 3 of each switch set are bent at right angles at theiroperating end. Thereby a good surface is provided for the cam disc torun onto. But this arrangement also enables the contact spring sets tobe mounted comparatively close to the cam discs 18. The contact spring 3or 4, which in each set has its bent end extending furthest into .thecam discs 18, is provided with a slot 21 (Figure 4), through which thecam discs 18 protrude in order to be able to operate the middle spring 3or 4. The right angle bend enables the slots 21 of these springs to bemade very short, so that they do not 1mnecessarily weaken the springs.The middle contact spring 3 and 4 are brought into contact with eithertheouter or the inner contact spring of their set, according as either acam or a valley of the cam disc 18 reaches the right angle bend of themiddle spring, while at other times the latter are placed in a neutralmiddle position by the cam discs. The driving magnet 1 operatesindirectly, that is to say the pawl 12 does not move on the cam cylinder17 until its armature 7 moves back to the normal position. At the sametime the switch pawl 12 is slightly moved out of its position parallelto the tooth wheel 11, but this does not affect the reliableengagementof the pawl into the teeth of the wheel, and it has the advantage thatit renders the position of the driving magnet less dependent on theswitch wheel. During the step by step movement of the shaft 17, the camdiscs 18 are also moved and each cam disc 18 in succession has itsoperating part extending into the slot 21 of the springs 3 and 4 of itscorresponding contact spring set, thus the contact springs controlled bythe cam discs are brought into their operated position. The indicatingdevice 19, 20 enables the position of the switch shaft to be ascertainedat any time.

'In order to render the operating parts easily accessible and tofacilitate the removal of the switch cylinder 2 from the switch, thebent strips 15 and 16 of the angle piece 5 are elongated to providesupports 22. 23,

, which are slotted to enable the shaft 17 to have its ends pushed intothese slots, 27, of the supports 22, 23 from above and from the front.After the shaft 17 has been inserted in the slots 27, the shaft islocked in position by special bearings 24 which receive the ends ofshaft 17 and which are inserted in the slots 27 in order to confine theends of the shaft 17 and so prevent its being moved sideways.

.The bearings 24 are retained in their slots 27 by means of two guardingpieces 20, 26. The

ing pieces 15 and 16, and their free ends ex- I tend into the upperportion of the slots 27 of the supports. shaft 17, the guarding pieces20, 26 are lifted out of the slots 27 in the supports22, 23 and arebrought into the position shown dotted in the Figure 3. With the guardsin this position, the bearings 24 can be taken out of the slots and theshaft 17 with its cams 1.8 can be removed from the supports after theoperating pawls' 12 and 14 have been lifted clear of the teeth of thetoothwheel 11 en- 'a ed by them. It will be seen from Figure that one ofthese guarding pieces 20 is so shaped that its free end also serves as'apointer for the indicating device 19, so that a special piece need notbe provided for this purose. p It is obvious that the individual partscan be constructed in a different manner than that shown and described.Of importance is the accessible and compact arrangement according to theinvention, which is mainly achieved by the location of the driving manet with respect to the switch cylinder, as 'well as by the location ofthe contact spring sets on one or both sides of the driving member andby the special construction of the contact springs.

What is claimed is: 1. In a sequence switch, a switch cylinder,

-a plurality of cams mounted on saidcylinder,

a motor magnet for operating said cylinder, two cooperating L-shapedbrackets, projecting means on said brackets for mounting said cylinderand motor magnet with the axis of one parallel to the axis of the other,and a plurality of spring contact sets arranged in rows on both sides ofsaid cylinder and mounted on said brackets in operative relation withsaid cams.

In order to remove the 2. In a sequence switch, a switch cylinder,

a plurality of cams mounted on said c linder, an electro-magnet foroperating sai cylinder, a pair of cooperating L-shaped brackets,projecting means on said brackets for mounting said cylinder and magnetwith the axis of one parallel to the axis of the other, detachablebearings and leaf springs cooperating with the projecting means forholding said cylinder in place, and a row of spring contact sets on eachside of said cylinder mounted on said brackets in operative relationwith said cams.

3. In a sequence switch, a cylinder carrying a plurality of cams, a rowof vertical contact springs .on each side of said cylinder and adaptedto be operated by said cams, a motor magnet included between said rowsand having the axis of its core parallel to the axis of said cylinder,said two axes lying in a vertical plane parallel to and midway betweensaid vertical rows of springs, a ratchet on one end of said cylinder, anarmature on the opposite end of said magnet and having an arm extendingbetween the magnet and the cylinder substantially parallel with the axesthereof, and

a pawl on the end of said arm and cooperating with said ratchet torotate said cylinder about its aXis under control of said magnet tocause said cams to operate said contact springs;

In witness whereof, I hereunto subscribe my name this 17th day ofSeptember, A. D. 1926. 4

I FRITZ DGRING.

In witness whereof, I hereunto subscribe my name this 17th day ofSeptember, A. D. 1926. I

. KONRAD MI'FLLER

